The NIQE [1]} is an NR-IQA metric of perceptually relevant spatial domain Natural Scene Statistics (NSS) features extracted from local image patches that capture the essential low-order statistics of natural images. The equation is given as:
\(\begin{aligned}& \hat{I}{(i,j)} = \frac{I_{(i,j)} - \mu _{(i,j)}}{\sigma _{(i,j)} + 1},\end{aligned}\) 
